Grinding-mill.



G. S. EMERIGK.

GBINDING MILL. APPLYIGATI'ON FILED oo'r. 18,1907.

Patented 136112184909.

2 SHEETS-SHEET 1.

mm1 ron 3 .Z cio G. S.; lEIMIERICKl GRINDING MlLL. APrLIoATIoN FILED00T. n.190?.

Patented 1m28, 1909.

LWITNESSES UNITED 'STATES PATENT oEEIoE.

GEORGE STOCKHAH EMEBIK, 0F NAZARETH, PENNSYLVANIA.

GRINbING-MILL.

Specification of Letters Patent. Patented Dec. 28, 1909,

Application led October 18, 1907. Serial No. 398,045.

To all whom. t .may concern:

Be it known that I, GEORGE S. EMERICK, a citizen of the United States,residing at Nazareth, in the county of Northampton and State ofPennsylvania, have invented certain new and useful Improvements inGrinding-M ills, of which the following is aspecii-` fully described andparticularly pointed out' iu the claim.

Figure 1 is a vertical section of a grinding and screening machineembodying my invention. Fig. 2 is a sectional plan view thereof, as onthe line 2-2, of Fig. 1.

-1 designates the frame work, the upper portion of which supports acasting 5 having a circular depression 6 therein for the reception ofthe ground material. Resting upon the tp of the casting 5 andsurrounding the depression 6 therein, is a circular frame 7, providedwith a cover. 8. The casting 5, frame 7, and cover 8 are securedtogether by suitable bolts 9, and they inclose a chamber 10, in whichthe material is ground.

The cover S is provided with a central bearing 11, in which is rotatablymounted a vertically arranged hollow shaft 12, the upper end of which isprovided with a driving pulley 13, which rests upon the bearing 11, andsupports the shaft 12., The lower end of the shaft 12 extends into thechamber 10, andV has formed thereon or secured thereto a rotatablegrinding member 14, provided with a horizontal portion 15, and avertical flange 16. The inner face of the vertical flange 16 is providedwith a hard meta-l ring 17, forming a grinding surface.

Resting normally in contact with the grinding surface of the ring 17, isa 4series of grinding rollers 18 which are carriedY by vertical shafts19, the axes of which are normally parallel to the grinding face of thering 17. 'Theshafts 19 extend upwardly through openings 20 in the cover8, and are supported in bearings 21. The upper ends of the shafts 19 areprovided with grooves 22, into which extend rings 23, which are securedbetween the bearings 21 and caps 24- thereon. These rings 23, engagingthe grooves 22, prevent longitudinal mov-.ement of the shafts 19.

Each bearing- 21 isarranged between two arms 25 which project .from afixed collar on the bea-ring 11, and each bearing 2l is provided withprojecting pivot studs 26 which extend into openings in the arms 25,thus pivotally supporting the bearings 21, shafts 19, and rollers 18, ina manner to from the grinding surface of the ring 17, the openings 2()being large enough to permit such movement.

Iivotally connected to each bearing 21 below the pivot stud 26, is theih ner end of a rod v27 which extends outwardly through an opening in a'lug 28 projecting from the screw-threaded for the reception of theinternally threaded hub of a hand wheel 29, between which and the lug 28is interposed a spring 30, surrounding the rod 27. The springs 30,bearing against the lugs 28 and the hubs of the hand wheel 29, tend toforce the rods 27, and therewith the bearings 21, outwardly, and thushold the rollers 18 yieldingly in contact with the grinding surface ofthe ring 17, from which they may vlbe moved on the pivot studs 26 inopposition to the springs 30. By adjusting the hand wheels 29, thepressure of the rollers 18 The lower end of the shaft 12 is providedwith lateral openings therein to permit mahorizontal portion 15 of thegrinding member 111. Arrangedwithin the hollow shaft 12 is a feed tube13, which is supported in the upper end of the shaft. The lower end ofthe tube 31 terminates above the grinding member 141, andl thevupper endof the tube is provided with a flaring mouth 32 for the reception of thematerial to be ground as it is introduced to the grinding member 14through the tube 31.

vArranged below the chamber 10 and surrounding the shaft 12, is acircular screen 33a which issupportcd at its upper end by a flange onthe casting 5; and surrounding the screen 33a is a circular screen 33,which is also supported at its upper end by a flange on the casting 5,thus forming an annular which the Ground material may descend.

The cast1n 5, or floor of the depression 6, is provide lwith openings 34therein, to

permit the rollers 18 to move vtoward andl frame 7. The outer end ofeach rod 2T is against the ring 17 may "be nicely regulated.

ferial to pass from the hollow shaft to the space between the screens 33and 33L through l ali'ord comnnuncation between the chamber l() and thespace between the screens 33 and 33, suitable blades 35'being providedon the bottom of the member 15 for delivering the ground materialwithin` the depression G to the openings or passageways 34.

Extending downwardlu from the bottom of the screen 33 is a conicalreceptacle 36 from the bottom of which extends a passageway 37 which maylead to a conveyer or any .suitable point of discharge.

Secured at its upper end to the grinding member 14. and extending downthrough a central bearing inthe casting 5, is a Vertical shaft 3S. Thisshaft 3S extends into the screen 33, and is provided with a collar 39,from which'project fan blades 40, the purpose of which vis to blow theground material through the screen 33 as it falls from the openings 34during the rotation of the shaft 1:2. y

Surrounding the screen 33 is a`cylindrical casing 43, which is supportedby a flange projecting'from the casting and which provides a chamber 44surrounding the screen 33. The bottom of the casing 43 is provided witha conical extension 45, Which surrounds the conical receptacle 36 andextends the chamber 44 down the outside of said receptacle. Leading fromthe lower end ofthe extension 45 or chamber 44, is a passageway 46,which may lead to a conveyer or any suitable point of discharge.

`The operation may be briefly described as follows The material to beground is introduced to the grinding member 14 through the tube 31, andpower is applied to the pulley 13 to rapidly rotate the shaft 1'2 andtherewith thegrinding member 14. The material to be ground passes fromthe horizontal portion of the member 14 by cen-.

trifugal action to and between the grinding surface of the ring 17, andthe rollers 18. During the rapid rotation of the member 14, the rollers18 are turned with or upon the shafts 19 by contact with the ring 17,and the material to be ground, and thus eti'ect the crushing or grindingoperation. After the material has been ground, it passes by centrifugalforce over the top of the in- .clined portion 16 of the member 14, and

falls by gravity into the depression 6, from which it is dischargedthrough the openings 34 into and through the space between the screens33 and 33% falls through the screen 33, it is blown by the blades 42against the screen and the tiner particles of the ground material passthrough the screen into the chamber 44, while the coarser particles fallinto the conical receptacle 36, and are discharged therefrom by gravitythrough the passageway 37. The tiner particles, after passing throughthe screen 33 into the chamber 44, descend by gravity through theextension 45, and are discharged through the passageway 4G.

The purpose of providing the screen 33a between the fan blades 40 andthe screen 33, is to prevent any lumps of hard substances or pieces ofiron, &c. that may descend from the openings 34 with the groundmaterial, from being struck by the fans 40 and knocked through thescreen 33.

In a grinding mill, walls forming the grinding chamber, grinding memberswithin said chamber, means for actuating lsaid members, a pair ofvertically arranged circular screens located one within the other insoaced relation to each other the wall 5 of said chamber having anopening therein ail'ording communication between saidchamber and thespace between said screens, a fan located adjacent one of said 'screensaway from the space formed between said screens for blowing the groundmaterial through one of saidl screens, and means for actuating said fan.

In testimony whereof I atlix my signature in presence of two Witnesses.

GEORGE STOCKHAM EMERICK.

litnesses A. V. GROUPE, E. M. WARE.

As the ground material.

